“The waterways of Japan have long been home to many mysteries, with a large number of accounts of various strange creatures lurking in the depths of Japans rivers, lakes, and coasts. Among such bizarre reports as reptilian serpents, merbeings, and giant fish, we can find a particular grouping of water cryptids in Japan that seems to sit in a category all its own; mysterious animals that, due to their behaviors or appearance, seem to most closely match some kind of mammal in nature.”